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HT95C40P Datasheet(PDF) 18 Page - Holtek Semiconductor Inc |
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HT95C40P Datasheet(HTML) 18 Page - Holtek Semiconductor Inc |
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18 / 51 page  HT95CXXX Rev. 1.50 18 May 26, 2005 · Normal mode or Green mode to Sleep mode: Step 1: Clear MODE0 to 0 Step 2: Clear MODE1 to 0 Step 3: Clear UPEN to 0 Step 4: Execute HALT instruction After Step 4, operation mode is changed to Sleep mode. · Normal mode or Green mode to Idle mode: Step 1: Set MODE0 to 1 Step 2: Clear MODE1 to 0 Step 3: Clear UPEN to 0 Step 4: Execute HALT instruction After Step 4, operation mode is changed to Idle mode. · Green mode to Normal mode: Step 1: Set UPEN to 1 Step 2: Software delay 20ms Step 3: Set MODE1 to 1 After Step 3, operation mode is changed to Normal mode. · Sleep mode or Idle mode to Green mode: Method 1: Any reset condition occurred Method 2: Any interrupt is active Method 3: Port A wake-up Note The Timer0, Timer1, RTC and dialer I/O interrupt function will not work at the Idle mode because the 32768Hz crystal is stopped. The reset conditions include power on reset, external re- set, WDT time-out reset. By examining the processor status flag, PDF and TO, the program can distinguish between different ²reset conditions². Refer to the Reset function for detailed description. The port A wake-up and interrupt can be considered as a continuation of normal execution. Each bit in port A can be independently selected to wake-up the device by mask option. Awakening from Port A stimulus, the pro- gram will resume execution of the next instruction. Any valid interrupts from Sleep mode or Idle mode may cause two sequences. One is if the related interrupt is disabled or the interrupt is enabled but the stack is full, the program will resume execution at the next instruc- tion. The other is if the interrupt is enabled and the stack is not full, the regular interrupt response takes place. It is necessary to mention that if an interrupt request flag is set to ²1² before entering the Sleep mode or Idle mode, the wake-up function of the related interrupt will be dis- abled. Once a Sleep mode or Idle mode wake-up event occurs, it will take SST delay time (1024 system clock period) to resume to Green mode. In other words, a dummy period is inserted after a wake-up. If the wake-up results from an interrupt acknowledge signal, the actual interrupt subroutine execution will be delayed by one or more cy- cles. If the wake-up results in the next instruction execu- tion, this will be executed immediately after the dummy period is finished. To minimize power consumption, all the I/O pins should be carefully managed before entering the Sleep mode or Idle mode. The Sleep mode or Idle mode is initialized by the HALT instruction and results in the following. · The system clock will be turned off. · The WDT function will be disabled if the WDT clock source is the instruction clock. · The WDT function will be disabled if the WDT clock source is the 32768Hz in Idle mode. · The WDT will still function if the WDT clock source is the WDT OSC. · If the WDT function is still enabled, the WDT counter and WDT prescaler will be cleared and recounted again. · The contents of the on chip RAM and registers remain unchanged. · All the I/O ports maintain their original status. · The flag PDF is set and the flag TO is cleared by hard- ware. Reset There are three ways in which a reset can occur. · Power on reset. · A low pulse onto RES pin. · WDT time-out. After these reset conditions, the Program Counter and Stack Pointer will be cleared to 0. To guarantee that the system oscillator is started and stabilized, the SST (System Start-up Timer) provides an extra-delay of 1024 system clock pulses when the sys- tem is reset or awakes from the Sleep or Idle operation mode. V D D R E S 1 0 0 k W 0 . 1 m F Reset Circuit |
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